Based on the geochemical results of sediments at site HD196 in Dongsha islands,the features of major elements show the tendency of two sections,and just consistent with the change of the ion content of pore water and methane in the sediment.

• 对南海北部东沙群岛附近具有BSR特征的HD196站位沉积物样品的地球化学特征进行综合分析,得到以下结果:柱状样沉积物的常量元素的分布具有分段性,且与沉积物孔隙水中的离子浓度和甲烷含量的变化趋势相一致,可能对其下面是否存在天然气水合物有指示意义;